COO JOUENAL 01- THE BOYAL HORTICULTUBAIi SOCIETY. 



conidia will directly infect another species of hcst-plant. In the case of 

 some mildews, as Neger (5) has lately shown, the conidia have not this 

 power, 



Fig. 160. 



Explanation of Figures. — Conidial stage of Spluorothcca mors-uva' (Schwein.) Berk. & 

 Curt., the American Gooseberry-mildew (drawn from material sent from Bally- 

 mena, Ireland). In centre, a single ripe conidiophore, bearing its chain of 

 conidia, x 255 ; to right, above, uppermost portion of a nearly ripe chain, 

 showing the fibrosin bodies in the cell-contents of the conidia, x 400 ; to right, 

 below, a germinating conidium, from the surfac e of a Gooseberry, x 400 ; to left, 

 a number of ripe conidia, x 400. 



S. mors-uva has been recorded in the United States on the following 

 species of liibes : B. ccrcum, li. Cynosbati, H. divaricatum var. irriguum, 

 li. Iloridanum, li. gracile, li. Grossularue, li. Hiidsonianum, E. lacustre, 



